Spraying apparatus



P. J. TIMBERLAKE SPRAYING APPARATUS Filed Dec. l5, 1937 July 15, 1941.

flitomwai 3 FAL/L. J 'MEERLAKE lll l/I Patented July 15, 1941sIieAviINcfirlalarrUsV Y Paul J. Tim'b'ferlake, Jackson; Mich.Application December 1s, 1937,'.seria1No.'1795467y j? s claires.V(014299-188) The present invention' relates to aisprayng andhot-airdrying device which has particular application in the servicing ofautomotive'vehicle transmissionl and differential casings, but whichalso hasv general application including the'apply- Aing of certaincoating materials anddrying them.

An object of the invention is to provide adevice for'heating airunderpressure and utilizing the heated air to heat-oilor a coating material,and at the same time to draw the oil or-coating material from acontainer.

Another object of I theinvention is-toprovide a -device having anozzle-from'which-:atfwill' may .be directed -hot air or asprayed-liquid.v -1' w Astill further object'. of the invention is toprovide a. combined .spraying-andhot' air blowing -device having anozzleprovidedwith structure toprevent under predetermined'conditionsits .removal'from the fillingopening of a` transmis- A.sionor.diierential casing or other opening into which ithas .beeninserted`yThese and other` objects -will beapparent from the. followingspecification when-takenwith the accompanying drawing, in fwhich: Fig.lis a partial vertical section Fig. 2 is an enlargedview of Aa valve,Fig.3 is anelevation of a retaining hooi; associatedwth the sprayingtip,y

Fig. 4 .isan elevationcf a safetyvscreen -disposed in. the air.gun-adjacent the outlet thereof, Fig. 5 ,is a verticalsection of analternative .structure for securing. theY mezz-lesto theair gun,

LFig. 6 isa section of a form of nozzle arranged `for quick cleaning.

Referring particularly to the drawing, reference character .I .indicatesanair .gunVV suchasris describedin my co-pending application VSerial No.

105,917, led October.16,.1936. ,Theairvgun comprises end frames .2 -and.3, .between which -is mounted an electric heating elementJIA connected`to an electric powerline and-,surroundedbyfa heat insulating casing Band anv expanded metal guard '.I. VCompressedair is admitted tothe lgunfrom a ,suitable source through attingA 8. con- "trolled by a shut-off4valve 9. .As.in. myV aforesaid cof-pendingy application, .the,compressedf..-.air

passes `into .the interiorpf the gunipast the-inlet end of the heatingelement .4. andis heated. The heated air is discharged past. the outletend .ofY the heating Velement tv intoa .threadedfpassage- I0 in the endframe 2 at theoutletendof thegun.

.The aforesaid structure Ais .substantially nthe "same as that. of my`above mentionedy co-,pending vof thestructure comprising the invention,

application. "The present invention'l comprises the combinationwithrsaid air gun of the heating and spraying device to' be described,as well as the particular structure and features of the heating andVspraying* device. v

'A nozzle 'I5 comprising a suitable tube is threadedat one end to theend frame 2 and at the other end has' threaded thereto a spraying tip16. The nozzle' I5rhas connected thereto a tube` I'I `which passesthrough the wall ofthe nozzle SI5 and extends inside thereoftolejeicting relationshipv with the tip I6. 'The interior bore of` thespraying tip I6 and the end of thetube I'I `associated therewithv areprovided with'tapers I8 f'and I9,' respectively, Aso' that as the tip I6is .adjusted .axially with respect to the nozzle 'SI5 ,theAcharacteristics of :thevspray which is pro'- :ducedare varied.

'.The tubellisconnected through'a valvef20 .to-a small container v2I,"thefcontaine'r'2l in'actual ypracticev :having a" capacity of onefpint, more or: less, although it' is to'` be understood that the "S'me'"of the container 2I..'is'not a limiting feature ,Y ofther'invention.The container 2|' is'en'closed at its rear end with a concave plate'22,-at the mid-:portion "of which'. is threaded a Drilling plug E23."The 'con'cavityxof the .plate "22fis="fori the fpurpose offacilitatingthe lling ofthe container 2 #when the 'same wup-ended. Atube 24 within Mthe container- 2 I communicates withthe-.valvef20 f Vandprojects tol the-lower rearfportionfof `ith'e -container '2 I in order.that yliquid ytherein Mmaybe ;as-1completely used up as possible. j i''The='valve20has provided 'inthe body thereof a'passageZS-fforconducting :liquid from the conjtainer- 2 I the passageZ-Stbeinginalignment with hapert-30' in the valve.- member 3 I- of the fvalve 1.-Ihe-functionfof .the passage 32` and theport-33 4 as liquid iswithdrawn-therefrom. The 'val-ve I2i) nis lcontrolledfbyazthumb piece34,- andits move- .mentis Vlimited by ja pin :i5-'movable with theAvalve member. 3I thereof. in fra slot 36 -in the. valve v.bodyspring'lvisemployedJtomaintaiIr-the ,valve member v3 IY seatedin Zri-Ii the`-usual manner; :It V1will be understood .thatfinoperation therotating-ofthe valve=mem ,ber..3.I 1by-.the-thumb pieceivlhivill`simultaneously .Y open Aorf-close thepassages A of` liquidV and'air,respectively.

A .f The nozzle I5 isV provided adjacent'- the outer j end .thereof...withal relatively fixed ange 40 z and port '33 -inftheevalvewmember43I of A the Vvalvelll.

the body of th'eyalvel has slidable thereon between the flange 40 andthe tip I6 a rounded seat 4I. A spring 42 is disposed on the nozzle Ibetween the flange 46 and the seat 4| to urge the seat 4I toward the tipI6.

Associated with the tip I6 is a hook 43 which, as shown particularly inFigs. 1 and 3, comprises a at washer like plate 44 having a threadedinternal opening 45 and an extended side 46, the end of which is turnedover to provide the hook 43. The hook 43 is disposed between the seat 4Iand the tip I6 and is threaded on the outer end of the nozzle I5 toabutting relation with the tip I6.

At the inner side of the end frame 2 is disposed a metallic screen 41 toprevent the flame of any oil or other vapors which may have ignited,either within or without the interior of the hot air gun I, from passingoutwardly 'orA inwardly with respect to the interior of the hot air gunI. The screen 41 is generally semi-spherical in shape and is secured toa bushing 48 provided with a seat 49. The interior of the bushing 48 ispreferably hexagonal inV cross-section, and the exterior is threaded tothreadably engage the threaded passage I9. 'I'he bushing 48, after beingmanually threaded into the threaded passage III, may be taken up, bymeans of an internally acting wrench, to urge the seat 49 against theinterior face of the end frame 2 to secure the bushing 48, and thus thescreen 41, in position.

The container 2|, while somewhatsupported by the tube I1, isadditionally supported by a bracket 55 which is in the form of ametallic band which is clamped by means of a bolt 56 about the container2|. The bracket 55 has an extension 51, which is flared out and providedwith an opening through which the nozzle I5 is passed. The extension 51is disposed on the nozzle I5 between the movable nut 58 and the nut 59xed with respect to the end frame 2. Thusafter the nozzle I 5 has beenthreaded into the threaded passage I6, takingup on the nut 58 not onlyclamps the bracket 55 to the hot air gun I but also locks the nozzle I5in the threaded passage Il).

In Fig. 5 is disclosed an alternativeform of connection between thenozzle I5 and the end frame 2. In this form there is threaded into thethreaded passageJIIl a sleeve 65 having an outwardly extending portion66 provided with bayonet slots 69. The inner end of the nozzle I5 isprovided with an enlarged extension 68 provided with pins 61, Aby meansof whichin cooperation with-the slots 69 the nozzle I5 is secured to theend frame 2. container 2| is provided with a clamping ring 1I which isclamped to the extension 68 by a bolt 12. The nozzle I5 is assembled onthe tubular extension 66 by loosely fittingthe bracket 55 on thecontainer 2| and the clamping ring 'II over the nozzle I5 and turningthe pinsY 61 into the slots 69. The bolts 56 and 12 are then tightenedto provide a rigid Support for the container 2|.

The foregoing structure, while primarily designed for cleaning andflushing transmission and differential casings ofautomotivevehicles, maybe used for a variety of purposes. In its use for servicing transmissionand differential casings, the tip I6 and the hook 43 are disposed withinthe filling opening of the casing to be serviced, the hook 43 beingmanipulated to engage a portion of the inner surface of the casing. Theseat 4| bears against the outer edge of the opening and is yieldablyurged thereagainst by the spring 42, the hook 43 opposing the action ofThe bracket `55 supporting the the spring 42. The valve 20 is closed atthe start of the servicing operation to close off the communication withthe container 2|, which has previously been filled with any suitablegrade of iiushing oil or the like. The heater is turned on, andcompressed air is admitted by opening the valve 9. Hot air is thenprojected into the interior of the casing, its escape through the llingopening being prevented by the seat 4|. By manipulating the nozzle I5through the air gun handle 10, hot air may be directed against differentportions of the interior of the casing to soften and loosen heavy greasetherein. The valve 20 is then opened. Oil from within the container 2|is drawn through the tubing I1 by the ejecting action of the air passingthrough the tip I6 and is sprayed by the tip I6 into the interior of thecasing. As the oil from the container 2| passes through the portion ofthe tube I1 within the nozzle I5, the hot air heats the oil so that anoil spray of high temperature is provided. The nozzle I5 may beappropriately manipulated to direct the spray against different interiorsurfaces of the casing. After the flushing with the hot spray has beencompleted, the valve 20 is closed and a blast of hot dry air is directedintovthe interior of the casing to dry the same. The servicing is thencompleted, and the tip I6 and hook 43 are withdrawnvv from the fillingopening.

The present invention also has particular utility in applying coatingmaterials which must be applied either hot or cold and which can bedried expeditiously with heat. In applying a coating material, thecontainer 2| is filled with the coating material and is sprayed in themanner herelnbefore described by opening the valve 20- and compressedair valve 9, either with or -without heat, as the specific coatingmaterial requires. The valve 20 is then closed and hot air applied todry the coating after it has been applied.

It will be clear that, in the use of the foregoing structure, whendifferent materials are used a separate nozzle I5 and container 2|assembly may be employed for each material used. Thus onek assemblywould be used for flushing oil, another assembly for blue lacquer, etc.

In Fig. 6 is disclosed an alternative form of nozzle and tip arrangementfor use particularly when a coating material is used. Coating materialshave a tendency to build up on the'inside of the tip, thereby hinderingthe spraying' operation. The nozzle I5 is provided with a threadedportion 13 adjacent the end thereof and at the end thereof is providedwith a cylindrical portion 14, about which telescopically ts a.tip.15..The tip 15 abuts against a washer-like member 16, threaded to theportion 13, which determines the relative axial position of the tip 15vwith respect to the tapered end lspoftheiube|1-f1t win be clear that bymovement o f the washer-like member 16 along Ythe threaded portion 13,the ad- Justrnent of the tip 15 with respect to the tapered end I9 ofthe tube I1 may be changed. Secured to the tip 15 are oppositelyprojecting trunnions 11, to which are pivoted links 18. rIhe linksnormally urge the tip 15 against the washer-like member 16, but when itisV desired to clean the interior of the tip 15 the links 18 are moveddownwardly to disengage the tip 15 from relation with the tapered end I9of the tube I1. lAir blowing through the nozzle I5 will then dislodgeany Ycoating material adhered to the interior of the tip 15 and cleanthe same. By actuating the links 18 to move the tip '15 back against thewasher-like member 16, the tip and nozzle assembly are placed incondition for use again.

Having thus described my invention, what I desire to secure by LettersPatent and claim is:

1. A device of the character described comprising a hot air gun having anozzle, a spraying tip on the outer end of said nozzle, a tube within aportion of said nozzle and communicating with said tip in ejectingrelation thereto, a source oi liquid communicating with said tube, meansto connect a source of compressed air to said gun, whereby said air,heated in said gun, draws said liquid into said tube, heats said liquidin said tube and sprays the same from said tip, a spring pressed sealingmember associated with said tip and a hook associated with said tip,whereby when said tip is disposed through an opening in a casing saidhook may be made to engage the inner wall thereof to prevent outwardmovement of said tip, and said sealing member engages with the outerwall thereof.

2. A device of the character described comprising a hot air gun having anozzle, a spraying tip having a connection to the outer end of saidnozzle, a tube within a portion of said nozzle and communicating withsaid tip in ejecting relation thereto, a source of liquid communicatingwith said tube, said source comprising a closed portable containersupported from said gun, means to connect a source of compressed air tosaid gun, whereby said air, heated in said gun, draws said liquid intosaid tube, heats said liquid in said tube and spraysthe same from saidtip, and a Valve to control the flow of liquid from said source, saidvalve having a passage for the outlet of liquid and a separate passagefor the inlet of air to said container.

3. A device of the character described, comprising a hot air gun havinga detachable nozzle, a spraying tip on the outer end of said nozzle, asource of liquid, said source comprising a portable container, a uidconnection from said source to said tip in ejecting relation thereto,means to connect a source of compressed air to said gun, whereby saidair heated in said gun draws liquid into said tube and sprays the samefrom said tip, means to transfer heat from said hot air to said liquid,a valve to control the flow of liquid from said source, and means tosupport said `container from said gun, said means comprising a bracketsecured to said container and clamped between said nozzle and said gun.

4. A device of the character described for directing a spray through arestricted opening into a chamber, comprising a spraying tip, a springpressed sealing member concentric with and axially slidable along theaxis of said tip, yand a hook xedly supported upon said tip, said hookbeing adapted to be disposed through said restricted opening into saidchamber and to bear against the interior of said chamber, and saidsealing member being adapted to yieldably bear 3 against the outside ofsaid chamber to seal said restricted opening, the reaction to saidspring pressed sealing member being resistedby said 5. A portablecombination hot air and liquid spraying gun comprising an air heatingchamber, an elongated conduit connected to said chamber at one end andhaving a nozzle at the K other end, `a tube for conducting liquid tosaid nozzle, said tube being housed for a portion oi its length in saidconduit in heat exchanging relation and having a tip portion adjacentsaid nozzle so located asrto be in a zone of reduced pressure when hotair is passed through said conduit, a liquid container supported inunitary relation with said chamber, but exteriorly of said chamber andconduit with which said tube connects, and means to connect said chamberto a source of compressed air whereby said air, heated in said chamber,draws said liquid into said tube, heats the liquid in said tube andsprays the same from said tip through said nozzle.

6. A compact portable combination hot air and liquid spraying gun havinga heating chamber, a pistol grip connected exteriorly of said chamberwith a substantial portion of said chamber projecting forwardly of saidgrip, a threaded outlet opening at the outer end of said chamber, aVremovable nozzle threadedly supported in said opening, a tank -forspraying liquids supported from said nozzle and constituting a unitarypart thereof, vsaid tank with the nozzle in position overlapping thatportion of said chamber for` wardly of the pistol grip, said tank beingsufri- Vciently spaced from a portion of said nozzleV threaded into saidopening as to clear said chamber when the nozzle isv secured to thechamber by relative rotation between the nozzle and chamber, and conduitmeans for conveying liquid from said tank to said nozzle. f

'7. A removable spraying nozzle assembly for hot air guns comprising anelongated conduit portion for connection with a hot air chamber of anair gun, a tube for the spraying liquid having a portion of its lengthhoused in said conduit portion in heat exchange relation, one end ofsaid tube having a spraying tip adjacent the end of said nozzle, a tankfor the sprayingliquid unitarily associated with said conduit portion,the other end of said tube being connected to said tank. Y

8. A removable spraying nozzle adapted to be threaded linto the barrelof a hot air gun comprising a nozzle portion, a tank, bracket meansextending between the threaded end of said nozzle and the tank toposition said tank rearwardly of the threaded portions of said nozzlesuiiiciently to one side of the axis thereof to enable the tank to clearthe barrel of the gun at the time the nozzle is threaded into position,and conduit means between the tank and nozzle.

PAUL J. TIMBERLAKE.

